A 2 digit is such that the product of its digits is 20.if 9 is added to the number the digits interchange their places find the number. with all the steps
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we assume two digit of a number X&Y
X×Y=20 (1)
10X+Y+9=10Y+X (2)
X-Y= -1
(x-y)^2=x^2+y2-2xy
x^2+y^2=41
x+y=9
two digit number will be 45
X×Y=20 (1)
10X+Y+9=10Y+X (2)
X-Y= -1
(x-y)^2=x^2+y2-2xy
x^2+y^2=41
x+y=9
two digit number will be 45
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